Casting this spell deals an amount of damage to you equal to quadruple a bladed weapon of your choice you are holding. When doing so, you add your Constitution modifier to the damage instead of Strength or Dexterity.   You drop a splattering of your blood upon the ground, causing a dark mass of malfeasance to form in a 20 ft. radius around you. Any creature within range must make a Wisdom saving throw, on a failure taking 4d8 psychic damage as a howling from the spirit world tears through their mind. Additionally, their vision is blocked by the whorling mass of dark entities, and all attacks they make are at disadvantage. An affected creature is unable to leave the mass, and every round spent in the mass decays their armor, decreasing their AC by 1 at the end each of their turns until their AC is equal to their base AC. They can repeat this saving throw at the start of their turn, ending all effects on a success.   You see clearly through the mass, and all attacks made by you against affected creatures are at advantage.